The invention relates to a sulfur hexafluoride gas valve of a novel needle valve structure. The sulfur hexafluoride gas valve comprises a valve body, a screw plug sealing ring, a screw plug, a valve rod, a sealing screw plug, a handle, a positioning plate, a positioning pin, a sealing screw plug sealing ring, a valve rod sealing ring I and a valve rod sealing ring II. The sulfur hexafluoride gas valve has the beneficial effects that the guarantee of the sealing performance of the valve is most important for the sulfur hexafluoride gas valve; when the valve is opened or closed by rotating the valve rod, the handle does not need to be moved vertically; in addition, the overall valve device has the self-locking function through the addition of the structures of the positioning plate and the positioning pin, use is convenient, and meanwhile the sealing performance of the device is also improved; and the ethylene-propylene-diene monomer o-shaped sealing rings are utilized so that the sealing performance of the device can be further ensured; and the whole valve device is simpler and more convenient to use in the use process; and safety is also greatly improved.